[FLINK-36142][table] Remove TestTableSourceWithTime and its subclasses to prepare removing TableEnvironmentInternal#registerTableSourceInternal

[xuyangzhong]

What is the purpose of the change

Remove TestTableSourceWithTime, TestLegacyProjectableTableSource and TestNestedProjectableTableSource prepare removing TableEnvironmentInternal#registerTableSourceInternal.

Note: this work involves removing the existing UT and IT tests for LegacyTableSource and LegacyTableSink(LegacyTableSource and LegacyTableSink will be cleaned in FLINK-36134).

Brief change log

• Remove TestTableSourceWithTime, TestLegacyProjectableTableSource and TestNestedProjectableTableSource
• Update or remove the related tests.

Verifying this change

This change is already covered by existing tests.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented?

[flinkbot]

CI report:

• bf7d50ca257c1cc7a04af29be9b03898fa2539a1 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[xuyangzhong]

The plans related to the deleted UTs are not be deleted temporarily, and will be deleted together when the entire test classes need to be cleared.

[xuyangzhong]

@flinkbot run azure

[lincoln-lil]

@xuyangzhong When I review these changes, I'm wondering if we could just remove all LegacyTableSourceTests, since eventually we will remove them, would that still require multiple modifications in subtasks before removing it?

[xuyangzhong]

@xuyangzhong When I review these changes, I'm wondering if we could just remove all LegacyTableSourceTests, since eventually we will remove them, would that still require multiple modifications in subtasks before removing it?

Sure. I have updated this pr to remove all LegacyTableSourceTest and LegacyTableSourceITCase.